A semi-automatic pipe cutting machine

Abstract

The present invention provides a semi-automatic pipe cutting machine, comprising a frame, on which a clamp assembly and a cutting assembly are arranged; the clamp assembly comprises a clamp frame, inside which a first clamp block and a second clamp block are symmetrically and slidingly connected, a clamping cavity is formed between the first clamp block and the second clamp block, a hydraulic oil cylinder is arranged on one side of the clamp frame, a piston rod of the hydraulic oil cylinder penetrates the clamp frame and is connected to the first clamp block, and a transmission mechanism is arranged inside the clamp frame. When in use, a pipe is put between the first clamp block and the second clamp block, and then the first clamp block is driven to move toward one side of the pipe by the hydraulic oil cylinder, and the first clamp block controls the second clamp block to move toward one side of the pipe through the transmission mechanism, and when the first clamp block and the second clamp block are pressed against each other, the first clamp block and the second clamp block hold the pipe tightly, so that the pipe fitting is not easy to rotate in the clamping cavity, so that the cutting assembly can quickly cut the pipe fitting, which improves the pipe cutting efficiency of the pipe cutting machine to a certain extent.

Description

Technical Field

[0001] The invention relates to a pipe cutting device, in particular to a semi-automatic pipe cutting machine. Background Art

[0002] At present, a Chinese patent with the announcement number CN204545557U discloses a pipe cutting machine, including a machine body, a roller frame is provided on the machine body, two rollers are rotatably connected on the roller frame, and the pipe to be cut is placed between the two rollers when in use, a main vertical beam is provided on the roller frame, a support arm is rotatably connected on the main vertical beam, a motor is provided on the end of the support arm facing the roller frame, a blade is provided on the output shaft of the motor, a hydraulic pump is provided on the end of the support arm away from the roller frame, a pressure rod is provided on the hydraulic pump, and the hydraulic pump is controlled by the pressure rod to drive the blade to press down, so as to cut the pipe placed between the two rollers. A reset spring is provided between the support arm and the main vertical beam, so as to quickly reset the pressed blade. However, since the two rollers rotatably connected to the roller frame have a weak restrictive effect on the pipe, when the blade is used to cut the pipe, the pipe will drive the roller to rotate circumferentially, and the rotation direction of the pipe is the same as that of the blade, which reduces the pipe cutting efficiency of the pipe cutting machine to a certain extent. Summary of the invention

[0003] In view of this, an object of the present invention is to provide a semi-automatic pipe cutting machine, which has the advantage of being able to effectively limit the circumferential rotation of the pipe fitting and to a certain extent improve the pipe cutting efficiency of the pipe cutting machine.

[0004] In order to solve the above technical problems, the technical solution of the present invention is: a semi-automatic pipe cutting machine, comprising a frame, on which a clamp assembly for clamping and fixing pipe fittings and a cutting assembly for cutting pipe fittings are arranged;

[0005] The clamp assembly comprises a clamp frame, a first clamp block and a second clamp block are symmetrically and slidably connected inside the clamp frame, when the first clamp block and the second clamp block are tightly pressed against each other, a clamping cavity is formed between the first clamp block and the second clamp block, a hydraulic cylinder is arranged on one side of the clamp frame, a piston rod of the hydraulic cylinder passes through the clamp frame and is connected to the first clamp block, a transmission mechanism is arranged inside the clamp frame, the transmission mechanism is used to connect the first clamp block and the second clamp block, and the transmission mechanism is used to drive the first clamp block and the second clamp block to move in opposite directions;

[0006] The cutting assembly includes a material receiving bracket arranged on a frame, a material receiving barrel being rotatably connected to the material receiving bracket, an inner hole of the material receiving barrel being opposite to the clamping cavity on the left and right, a rotating drive mechanism being arranged on the material receiving bracket, the rotating drive mechanism being used for driving the material receiving barrel to rotate circumferentially, a knife disc being arranged on the end of the material receiving barrel close to the clamp assembly, a cutting knife being arranged on the knife disc, and the cutting knife being used for cutting off the pipe fitting extending into the material receiving barrel.

[0007] Through the above technical solution, when in use, the pipe is placed between the first clamping block and the second clamping block, and then the first clamping block is driven by the hydraulic cylinder to move toward one side of the pipe. The first clamping block controls the second clamping block to move toward one side of the pipe through the transmission mechanism. When the first clamping block and the second clamping block are tightly pressed against each other, the first clamping block and the second clamping block hold the pipe tightly, making it difficult for the pipe to rotate in the clamping cavity. In this way, the cutting assembly can quickly cut off the pipe, which improves the pipe cutting efficiency of the pipe cutting machine to a certain extent.

[0008] The first clamping block is connected to the second clamping block through a transmission mechanism, so when the hydraulic cylinder drives the first clamping block to move, the transmission mechanism can drive the second clamping block to move in the opposite direction, which is more convenient to use.

[0009] When one end of the pipe is inserted into the inner hole of the receiving barrel and the pipe is clamped by the clamp assembly, the receiving barrel is controlled to rotate circumferentially by the rotating drive mechanism. When the receiving barrel rotates circumferentially, the cutter disc and the cutting knife can rotate circumferentially. The cutting knife can cut off the end of the pipe inserted into the receiving barrel during the rotation process. The cut pipe will fall into the receiving barrel, and the worker can take out the cut pipe from the end of the receiving barrel away from the clamp assembly.

[0010] Preferably, the transmission mechanism includes a transmission rack 1, a transmission gear and a transmission rack 2, the transmission rack 1 is slidably connected in the clamp frame, and one end of the transmission rack 1 is fixedly connected to the first clamp block, the transmission gear is rotatably connected in the clamp frame, and the transmission gear is meshed with the transmission rack 1, the transmission rack 2 is slidably connected in the clamp frame, the transmission rack 2 is located on the side of the transmission gear away from the transmission rack 1, the transmission rack 2 is meshed with the transmission gear, and one end of the transmission rack 2 is fixedly connected to the second clamp block.

[0011] Through the above technical solution, when the first clamp moves, it moves with the transmission rack 1, the transmission rack 1 drives the transmission gear to rotate circumferentially, and the transmission gear drives the transmission rack 2 to move. Since the transmission rack 1 and the transmission rack 2 are arranged on both sides of the transmission gear, the movement directions of the transmission rack 1 and the transmission rack 2 are opposite, so the first clamp and the second clamp will move in opposite directions.

[0012] Preferably, the first clamping block comprises a first sliding block, a first connecting block and a first clamping block, the first sliding block is slidably connected in the clamp frame, a first clamping groove is provided at a side wall of the first sliding block close to the second clamping block, the first connecting block is arranged in the first clamping groove, and the first connecting block is screwed to the first sliding block, a first mounting groove is provided at a side wall of the first connecting block close to the second clamping block, the first clamping block is arranged in the first mounting groove, and the first clamping block is screwed to the first connecting block;

[0013] The second clamping block includes a second sliding block, a second connecting block and a second clamping block. The second sliding block is slidably connected in the clamp frame. A second clamping groove is provided at the side wall of the second sliding block close to the first clamping block. The second connecting block is arranged in the second clamping groove, and the second connecting block is screwed to the second sliding block. A second mounting groove is provided at the side wall of the second connecting block close to the first clamping block. The second clamping block is arranged in the second mounting groove, and the second clamping block is screwed to the second connecting block.

[0014] Through the above technical solution, the first clamping block is divided into the first sliding block, the first connecting block and the first clamping block, the first connecting block is screwed to the first sliding block, and the first clamping block is threaded to the first connecting block, so that it can be replaced according to the shape of the pipe during use. The second clamping block is divided into the second sliding block, the second connecting block and the second clamping block, so that it can be replaced according to the shape of the pipe during use, the second connecting block is screwed to the second sliding block, and the second clamping block is threaded to the second connecting block.

[0015] Preferably, the first clamping block is provided with a first flange, the first flange is pressed against the side wall of the first connecting block, and the first clamping block is fixed to the first connecting block by screws via the first flange; the second clamping block is provided with a second flange, the second flange is pressed against the side wall of the second connecting block, and the second clamping block is fixed to the second connecting block by screws via the second flange.

[0016] According to the above technical solution, the first clamping block is connected to the first connecting block by the first flanging screw, so that the first clamping block will not dent the pipe. The second clamping block is connected to the second connecting block by the second flanging screw, so that the second clamping block will not dent the pipe.

[0017] Preferably, the clamp frame is symmetrically provided with a first chip keeper sheet and a second chip keeper sheet, the first chip keeper sheet is opposite to the first clamping block front and back, the second chip keeper sheet is opposite to the second clamping block front and back, and the first chip keeper sheet and the second chip keeper sheet are both tangent to the edge of the clamping cavity.

[0018] Through the above technical solution, the first chip blocking piece and the second chip blocking piece can block the processing debris, making it difficult for the processing debris to enter the clamping cavity, so that the pipe is not easily dented and the surface finish of the pipe is better.

[0019] Preferably, an extension block is provided on the end of the second transmission rack close to the second sliding block, the extension block is perpendicular to the second transmission rack, and the extension block is fixed to the second sliding block by screws.

[0020] Through the above technical solution, the transmission rack 2 is fixed to the second sliding block by the extension block screw, so that the assembly of the transmission rack 2 and the second sliding block becomes more convenient.

[0021] Preferably, the second connecting block is provided with a sliding positioning groove for the extension block to be placed in.

[0022] Through the above technical solution, when the extension block and the second connecting block are not fixed by screws, the extension block can be placed into the sliding positioning groove, and the extension block can be controlled to slide inside the sliding positioning groove, so that the transmission rack 2 is meshed with the transmission gear, making the assembly of the transmission rack 2 and the second sliding block more convenient.

[0023] Preferably, a groove is formed at the side wall of the first sliding block away from the second clamping block, and the end of the piston rod of the hydraulic cylinder is fixed at the inner groove wall of the groove close to the second clamping block.

[0024] Through the above technical solution, the end of the piston rod of the hydraulic cylinder is located inside the groove, so that when the piston rod of the hydraulic cylinder is retracted, no gap will be left between the first sliding block and the clamp frame, which helps to reduce the volume of the clamp.

[0025] Preferably, there are two groups of clamp assemblies, which are respectively a fixed clamp assembly close to the cutting assembly and a movable clamp assembly away from the cutting assembly; a sliding drive assembly is provided on the frame, and the sliding drive assembly is used to drive the movable clamp assembly to approach or move away from the fixed clamp assembly.

[0026] Through the above technical solution, when it is necessary to cut the pipe fitting, the movable clamp assembly is first used to clamp the pipe fitting, and then the movable clamp assembly and the pipe fitting are controlled by the sliding drive assembly to move toward the cutting assembly, so that the end of the pipe fitting passes through the fixed clamp assembly and penetrates into the receiving barrel, and then the pipe fitting is clamped by the fixed clamp assembly, and finally the pipe fitting is cut by the cutting assembly. The purpose of automatic feeding can be achieved by cooperating with the sliding drive assembly and the movable clamp assembly, which greatly improves the automation degree of the pipe cutting machine and makes the use of the pipe cutting machine more convenient.

[0027] Preferably, the cutting knife includes a knife seat fixed on the knife disc, a dovetail groove is provided at the end surface of the knife seat facing away from the knife disc, a knife head is slidably arranged inside the dovetail groove, and an oil cylinder is arranged on the knife disc, the end of the oil cylinder piston rod extends into the dovetail groove and is fixedly connected to the knife head.

[0028] Through the above technical solution, when the pipe needs to be placed inside the receiving barrel, the cutter head is controlled by the oil cylinder to move away from the inner hole of the receiving barrel, so that the cutter head is retracted to the left and right of the cutter disc, so that the cutter head will not hinder the process of inserting the pipe into the receiving barrel. When the pipe needs to be cut, the cutter head is driven by the oil cylinder to move toward the axis of the receiving barrel, so that the cutter head conflicts with the pipe, so that the pipe can be cut when the cutter head rotates. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 It is a structural schematic diagram of an embodiment;

[0030] Figure 2 is a structural schematic diagram of the fixture assembly;

[0031] Figure 3 is a partial schematic diagram of the fixture assembly;

[0032] Figure 4 A schematic cross-sectional view of the fixture assembly.

[0033] Figure numerals: 1, clamp frame; 2, first clamp block; 3, second clamp block; 31, second sliding block; 32, second connecting block; 33, second clamping block; 4, clamping cavity; 5, hydraulic cylinder; 6, transmission mechanism; 61, transmission rack 1; 62, transmission gear; 63, transmission rack 2; 7, first clamping groove; 8, first mounting groove; 9, second clamping groove; 10, second mounting groove; 11, first flange; 12, second flange; 13, first chip stopper; 1 4. Second chip stopper; 15. Extension block; 16. Sliding positioning groove; 17. Groove; 18. Material receiving bracket; 19. Material receiving barrel; 20. Rotation drive mechanism; 21. First sliding block; 22. First connecting block; 23. First clamping block; 24. Cutter disc; 25. Cutting knife; 251. Cutter seat; 252. Cutter head; 253. Oil cylinder; 26. Fixed fixture assembly; 27. Movable fixture assembly; 28. Sliding drive assembly; 29. ​​Dovetail groove; 30. Frame. DETAILED DESCRIPTION

[0034] The specific implementation modes of the present invention are further described below in conjunction with the accompanying drawings to make the technical solutions of the present invention easier to understand and grasp.

[0035] A semi-automatic pipe cutting machine, such as Figures 1 to 4As shown, it includes a frame 30, on which are disposed a clamp assembly for clamping and fixing the pipe fittings and a cutting assembly for cutting the pipe fittings.

[0036] There are two groups of clamp assemblies, which are respectively a fixed clamp assembly 26 close to the cutting assembly and a movable clamp assembly 27 away from the cutting assembly; a sliding drive assembly 28 is provided on the frame 30, and the sliding drive assembly 28 is used to drive the movable clamp assembly 27 to approach or move away from the fixed clamp assembly 26. The sliding drive assembly 28 includes a sliding frame connected to the frame 30 by sliding rails, and the movable clamp assembly 27 is provided on the sliding frame. A lead screw is rotatably connected to the sliding frame, and when the lead screw rotates, the movable clamp assembly 27 can be driven by the sliding frame to slide along the guide rail. A motor is provided on the frame 30, and the motor is connected to the lead screw through a coupling. When the motor is powered on, it can drive the lead screw to rotate circumferentially.

[0037] The clamp assembly includes a clamp frame 1, and a first clamp block 2 and a second clamp block 3 are symmetrically and slidingly connected to the inside of the clamp frame 1. When the first clamp block 2 and the second clamp block 3 are tightly abutted, a clamping cavity 4 is formed between the first clamp block 2 and the second clamp block 3. A hydraulic cylinder 5 is arranged on one side of the clamp frame 1. The piston rod of the hydraulic cylinder 5 passes through the clamp frame 1 and is connected to the first clamp block 2. A transmission mechanism 6 is arranged inside the clamp frame 1. The transmission mechanism 6 is used to connect the first clamp block 2 and the second clamp block 3, and the transmission mechanism 6 is used to drive the first clamp block 2 and the second clamp block 3 to move in opposite directions.

[0038] The first chip blocking piece 13 and the second chip blocking piece 14 are symmetrically arranged on the clamp frame 1. The first chip blocking piece 13 is opposite to the first clamp block 2 front and back, and the second chip blocking piece 14 is opposite to the second clamp block 3 front and back. The first chip blocking piece 13 and the second chip blocking piece 14 are tangent to the edge of the clamping cavity 4.

[0039] The transmission mechanism 6 includes a transmission rack 1 61, a transmission gear 62 and a transmission rack 2 63. The transmission rack 1 61 is slidably connected in the clamp frame 1, and one end of the transmission rack 1 61 is fixedly connected to the first clamp block 2. The transmission gear 62 is rotatably connected in the clamp frame 1, and the transmission gear 62 is meshed with the transmission rack 1 61. The transmission rack 2 63 is slidably connected in the clamp frame 1. The transmission rack 2 63 is located on the side of the transmission gear 62 away from the transmission rack 1 61. The transmission rack 2 63 is meshed with the transmission gear 62, and one end of the transmission rack 2 63 is fixedly connected to the second clamp block 3.

[0040] The first clamping block 2 includes a first sliding block 21, a first connecting block 22 and a first clamping block 23. The first sliding block 21 is slidably connected in the clamp frame 1. A first clamping groove 7 is provided at the side wall of the first sliding block 21 close to the second clamping block 3. The first connecting block 22 is arranged in the first clamping groove 7, and the first connecting block 22 is screwed to the first sliding block 21. A first mounting groove 8 is provided at the side wall of the first connecting block 22 close to the second clamping block 3. The first clamping block 23 is arranged in the first mounting groove 8, and the first clamping block 23 is screwed to the first connecting block 22. A first flange 11 is provided on the first clamping block 23, and the first flange 11 is tightly pressed against the side wall of the first connecting block 22. The first clamping block 23 is screwed to the first connecting block 22 through the first flange 11. A groove 17 is provided at the side wall of the first sliding block 21 away from the second clamping block 3, and the end of the piston rod of the hydraulic oil cylinder 5 is fixed to the inner groove wall of the groove 17 close to the second clamping block 3.

[0041] The second clamping block 3 includes a second sliding block 31, a second connecting block 32 and a second clamping block 33. The second sliding block 31 is slidably connected in the clamp frame 1. The second sliding block 31 is provided with a second clamping groove 9 at the side wall near the first clamping block 2. The second connecting block 32 is arranged in the second clamping groove 9, and the second connecting block 32 is screwed to the second sliding block 31. The second connecting block 32 is provided with a second mounting groove 10 at the side wall near the first clamping block 2. The second clamping block 33 is arranged in the second mounting groove 10, and the second clamping block 33 is screwed to the second connecting block 32. The second clamping block 33 is provided with a second flange 12, the second flange 12 is tightly abutted against the side wall of the second connecting block 32, and the second clamping block 33 is screwed to the second connecting block 32 through the second flange 12. An extension block 15 is provided at the end of the transmission rack 2 63 near the second sliding block 31. The extension block 15 is perpendicular to the driven rack 2 63, and the extension block 15 is screwed to the second sliding block 31. The second connecting block 32 is provided with a sliding positioning groove 16 for the extension block 15 to be placed in.

[0042] The cutting assembly includes a material receiving bracket 18 disposed on a frame 30. A material receiving barrel 19 is rotatably connected to the material receiving bracket 18, and the inner hole of the material receiving barrel 19 is opposite to the clamping cavity 4 on the left and right. A rotation drive mechanism 20 is disposed on the material receiving bracket 18, and the rotation drive mechanism 20 is used to drive the material receiving barrel 19 to rotate circumferentially. In this embodiment, the rotation drive mechanism 20 is a motor and a gear pair, and when the motor is powered on, the gear pair drives the material receiving barrel 19 to rotate circumferentially. A knife disc 24 is disposed on the end of the material receiving barrel 19 close to the clamp assembly, and two groups of cutting knives 25 are symmetrically disposed on the side of the knife disc 24 facing away from the material receiving barrel 19, and the cutting knives 25 are used to cut off the pipe fittings extending into the material receiving barrel 19. The cutting knife 25 includes a knife seat 251 fixed on the knife disc 24. A dovetail groove 29 is provided at the end face of the knife seat 251 facing away from the knife disc 24. A knife head 252 is slidably arranged inside the dovetail groove 29. An oil cylinder 253 is arranged on the knife disc 24. The end of the piston rod of the oil cylinder 253 extends into the dovetail groove 29 and is fixedly connected to the knife head 252.

[0043] Of course, the above are only typical examples of the present invention. In addition, the present invention may also have many other specific implementations. All technical solutions formed by equivalent replacement or equivalent transformation fall within the scope of protection required by the present invention.

Claims

1. A semi-automatic pipe cutting machine, Its characteristics are: It comprises a frame (30), on which a clamp assembly for clamping and fixing the pipe fittings and a cutting assembly for cutting the pipe fittings are arranged; The clamp assembly includes a fixed clamp assembly 26 close to the cutting assembly and a movable clamp assembly 27 away from the cutting assembly; a sliding drive assembly 28 is provided on the frame 30, and the sliding drive assembly 28 is used to drive the movable clamp assembly 27 to approach or move away from the fixed clamp assembly 26; the sliding drive assembly 28 includes a sliding frame slidably connected to the frame 30 through a slide rail, and the movable clamp assembly 27 is provided on the sliding frame; The clamp assembly comprises a clamp frame (1), wherein a first clamp block (2) and a second clamp block (3) are symmetrically and slidably connected to each other in the clamp frame (1), and when the first clamp block (2) and the second clamp block (3) are pressed against each other, a clamping cavity (4) is formed between the first clamp block (2) and the second clamp block (3), a hydraulic cylinder (5) is arranged on one side of the clamp frame (1), a piston rod of the hydraulic cylinder (5) passes through the clamp frame (1) and is connected to the first clamp block (2), and a transmission mechanism (6) is arranged inside the clamp frame (1), the transmission mechanism (6) is used to connect the first clamp block (2) and the second clamp block (3), and the transmission mechanism (6) is used to drive the first clamp block (2) and the second clamp block (3) to move in opposite directions; The cutting assembly comprises a material receiving bracket (18) arranged on a frame (30), a material receiving barrel (19) being rotatably connected to the material receiving bracket (18), an inner hole of the material receiving barrel (19) being opposite to the clamping cavity (4) on the left and right, a rotation driving mechanism (20) being arranged on the material receiving bracket (18), the rotation driving mechanism (20) being used for driving the material receiving barrel (19) to rotate circumferentially, a knife disc (24) being arranged on the end of the material receiving barrel (19) close to the clamping assembly, a cutting knife (25) being arranged on the knife disc (24), the cutting knife (25) being used for cutting off a pipe fitting extending into the material receiving barrel (19).

2. A semi-automatic pipe cutting machine according to claim 1, Its characteristics are: The transmission mechanism (6) comprises a transmission rack bar 1 (61), a transmission gear (62) and a transmission rack bar 2 (63); the transmission rack bar 1 (61) is slidably connected in the clamp frame (1), and one end of the transmission rack bar 1 (61) is fixedly connected to the first clamp block (2); the transmission gear (62) is rotatably connected in the clamp frame (1), and the transmission gear (62) is meshed with the transmission rack bar 1 (61); the transmission rack bar 2 (63) is slidably connected in the clamp frame (1), the transmission rack bar 2 (63) is located on a side of the transmission gear (62) away from the transmission rack bar 1 (61), the transmission rack bar 2 (63) is meshed with the transmission gear (62), and one end of the transmission rack bar 2 (63) is fixedly connected to the second clamp block (3).

3. A semi-automatic pipe cutting machine according to claim 2, Its characteristics are: The first clamping block (2) comprises a first sliding block (21), a first connecting block (22) and a first clamping block (23); the first sliding block (21) is slidably connected in the clamp frame (1); a first clamping groove (7) is provided on a side wall of the first sliding block (21) close to the second clamping block (3); the first connecting block (22) is arranged in the first clamping groove (7), and the first connecting block (22) is screw-connected to the first sliding block (21); a first mounting groove (8) is provided on a side wall of the first connecting block (22) close to the second clamping block (3); the first clamping block (23) is arranged in the first mounting groove (8), and the first clamping block (23) is screw-connected to the first connecting block (22); The second clamping block (3) comprises a second sliding block (31), a second connecting block (32) and a second clamping block (33); the second sliding block (31) is slidably connected in the clamp frame (1); a second clamping groove (9) is provided on the side wall of the second sliding block (31) close to the first clamping block (2); the second connecting block (32) is arranged in the second clamping groove (9), and the second connecting block (32) is screw-connected to the second sliding block (31); a second installation groove (10) is provided on the side wall of the second connecting block (32) close to the first clamping block (2); the second clamping block (33) is arranged in the second installation groove (10), and the second clamping block (33) is screw-connected to the second connecting block (32).

4. A semi-automatic pipe cutting machine according to claim 3, Its characteristics are: The first clamping block (23) is provided with a first flange (11), the first flange (11) is tightly abutted against the side wall of the first connecting block (22), and the first clamping block (23) is fixed to the first connecting block (22) by screws via the first flange (11); the second clamping block (33) is provided with a second flange (12), the second flange (12) is tightly abutted against the side wall of the second connecting block (32), and the second clamping block (33) is fixed to the second connecting block (32) by screws via the second flange (12).

5. A semi-automatic pipe cutting machine according to claim 1, Its characteristics are: The clamp frame (1) is symmetrically provided with a first chip blocking piece (13) and a second chip blocking piece (14); the first chip blocking piece (13) is opposite to the first clamp block (2) in front and back, and the second chip blocking piece (14) is opposite to the second clamp block (3) in front and back; the first chip blocking piece (13) and the second chip blocking piece (14) are both tangent to the edge of the clamping cavity (4).

6. A semi-automatic pipe cutting machine according to claim 3, Its characteristics are: An extension block (15) is provided on the end of the second transmission rack (63) close to the second sliding block (31); the extension block (15) is perpendicular to the second transmission rack (63); and the extension block (15) is screwed to the second sliding block (31).

7. A semi-automatic pipe cutting machine according to claim 6, Its characteristics are: The second connecting block (32) is provided with a sliding positioning groove (16) for the extension block (15) to be placed therein.

8. A semi-automatic pipe cutting machine according to claim 3, Its characteristics are: A groove (17) is provided on the side wall of the first sliding block (21) away from the second clamping block (3), and the end of the piston rod of the hydraulic cylinder (5) is fixed in the groove (17) near the inner groove wall of the second clamping block (3).

9. A semi-automatic pipe cutting machine according to claim 1, Its characteristics are: There are two sets of clamp assemblies.

10. A semi-automatic pipe cutting machine according to claim 1, Its characteristics are: The cutting knife (25) comprises a knife seat (251) fixed on the knife disc (24); a dovetail groove (29) is provided at the end surface of the knife seat (251) facing away from the knife disc (24); a knife head (252) is slidably arranged inside the dovetail groove (29); an oil cylinder (253) is arranged on the knife disc (24); the end of the piston rod of the oil cylinder (253) extends into the dovetail groove (29) and is fixedly connected to the knife head (252).

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